Your posture collapses as you are throwing your upper body/spine/weight down over the top the front leg and leaving the lower spine and hips behind the throw. You finish with your spine pointed down the target line and head/shoulders past the front foot, your spine should finish more perpendicular and/or upright to the target line with the head/shoulders still braced from the inside of the foot. Your lower spine/weight should lead/sync the upper spine transfer to the inside of the front leg/foot/heel, so you finish more upright and stacked in posture.

Your hips and shoulders do not work at all they turn along with the legs. You need a little more bracing to lengthen the pause. Your arm seems too tense and it probably is that even before the first step. Strong arming. Exhaling deeply and shaking the arm and staying that loose helps. That way you will get a snappier throw. I would like to see less sole to ground contact in the plant step for safety power and consistency. You need a dry normal friction tee to practice on.

Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.

I have another video that I recorded the other night, but it was almost dark and i'm not sure how to change the contrast/brightness of the video (permanently). Anyone know of an easy way to adjust this? I was able to change the settings in VLC media player, but that was only for viewing and didn't affect the original video.

My findings (I went off of concrete this time): Resisting the collapse even slightly seemed to be the difference between me half hitting and not hitting, but i'm not used to digging in this hard so I'll have to keep working on that. It seems like my upper body collapses because it shifts slightly towards the target (right around the right pec area), do you think it would be better to be facing more towards the camera for longer?

EDIT: I figured out how to save the contrast/brightness (you may want to mute it, i don't know what happened to the sound), here is the video:

Yes you should have a longer pause aka looking at the camera longer. Tightening up the lower body muscles in the tummy and back should help in keeping you upright at the hit. It is ok to lean forward in the follow through.

Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.